策略模式在spring中的应用

喜欢ヅ旅行 2022-11-30 15:56 212阅读 0赞

目的：

1）减少程序中大量if else 导致的代码可读性差。

2）好多网上示例太过原始

3）让开发人员了解设计模式在真实开发中的应用而不是胡乱模仿.

不扯淡直接上代码

以结算为案例，结算实现两种规则，1、金卡结算。2、银卡结算。

一、定义接口

public interface SettleAccount \{  
    /\*\*  
     \* 结算  
     \* @param account  
     \*/  
    void settle(String account);  
\}

二、实现金卡结算

/\*\*  
 \* 金卡结算  
 \* @author hfkj  
 \*  
 \*/  
@Slf4j  
@Service("settleRuleGold")  
public class SettleRuleGold implements SettleAccount \{

@Override  
    public void settle(String account) \{  
        // TODO Auto-generated method stub  
        log.info("金卡结算");  
    \}

三、实现银卡结算

/\*\*  
 \* 银卡结算  
 \* @author hfkj  
 \*  
 \*/  
@Slf4j  
@Service("settleRuleSilver")  
public class SettleRuleSilver implements SettleAccount \{

@Override  
    public void settle(String account) \{  
        // TODO Auto-generated method stub  
        log.info("银卡结算");  
    \}

四、通过spring获取bean工俱类

package com.ni.ksxtjk.util;

import org.springframework.beans.BeansException;  
import org.springframework.beans.factory.NoSuchBeanDefinitionException;  
import org.springframework.context.ApplicationContext;  
import org.springframework.context.ApplicationContextAware;  
import org.springframework.stereotype.Component;

@Component  
public class SpringContextUtil implements ApplicationContextAware \{  
      
    private static ApplicationContext applicationContext = null;

public void setApplicationContext(ApplicationContext arg0) throws BeansException \{

if (applicationContext == null) \{

applicationContext = arg0;

public static ApplicationContext getApplicationContext() \{

return applicationContext;

public static void setAppCtx(ApplicationContext webAppCtx) \{

if (webAppCtx != null) \{

applicationContext = webAppCtx;

/\*\*

\* 拿到ApplicationContext对象实例后就可以手动获取Bean的注入实例对象

\*/

public static <T> T getBean(Class<T> clazz) \{

return getApplicationContext().getBean(clazz);

public static <T> T getBean(String name, Class<T> clazz) throws ClassNotFoundException \{

return getApplicationContext().getBean(name, clazz);

public static final Object getBean(String beanName) \{

return getApplicationContext().getBean(beanName);

public static final Object getBean(String beanName, String className) throws ClassNotFoundException \{

Class<?> clz = Class.forName(className);

return getApplicationContext().getBean(beanName, clz.getClass());

public static boolean containsBean(String name) \{

return getApplicationContext().containsBean(name);

public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException \{

return getApplicationContext().isSingleton(name);

public static Class<?> getType(String name) throws NoSuchBeanDefinitionException \{

return getApplicationContext().getType(name);

public static String\[\] getAliases(String name) throws NoSuchBeanDefinitionException \{

return getApplicationContext().getAliases(name);

五、结算工厂

@Slf4j  
public class SettleAccountFactory \{

public static SettleAccount match(String name) \{  
        try \{

//通过spring获取实例Bean  
            return SpringContextUtil.getBean(name, SettleAccount.class);  
        \} catch (ClassNotFoundException e) \{  
            // TODO Auto-generated catch block  
            log.error("exception reason is class not found,class name is SettleAccount",e);  
        \}  
        return null;  
    \}

//测试方法  
    public static void main(String\[\] args) \{  
        SettleAccount settleAccount=SettleAccountFactory.match("settleRuleGold");  
        settleAccount.settle("account");  
    \}

完毕，以上是案例，通过测试是可行的。